ENS 52802
ENS Event | |
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14:14 Jun 12, 2017 | |
Title | Offsite Notification for Discharge of Circulating Water |
Event Description | On Sunday, June 11, 2017 at 1200 CDT, a Chemistry Technician reported water from the Circulating Water Blowdown (CW B/D) valve building had been pumped onto the ground outside the CW B/D building during a maintenance activity. The sump in the CW B/D building has a sump pump discharge hose that had been routed outside to the ground near the outfall canal rather than to the permitted outfall path. Water sample analysis results confirmed the presence of tritium. The sump pump discharge hose was rerouted to the required outfall on June 11th, 2017 at 1500 CDT. The discharge flow did not leave the site boundary before reaching the permitted discharge pathway.
In accordance with the Braidwood Station Illinois Environmental Protection Agency (IEPA) Consent Order dated March 11, 2010, the IEPA was notified of the blowdown line release on June 12, 2017 at 0914 CDT; the Illinois Emergency Management Agency (IEMA) was subsequently notified. Local agencies in the Braidwood area will also be notified. Follow-up analyses are being performed to determine if additional IEPA or IEMA notifications will be required. The release tank values for other radionuclides (i.e., other than tritium) were interpolated based on tritium values for the release tank, dilution from the CW B/D, and sampled sump tritium values; and determined to be less than Minimum Detectable Activity (MDA). Within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> of determination that state and local agencies notification will be made, the NRC Operations Center is required to be notified. There were no public health risks associated with the event. The NRC Resident Inspector was notified. Due to the notification of government agencies, this event is being reported under 10 CFR 50.72(b)(2)(xi).
The Illinois Environmental Protection Agency (IEPA) and the Illinois Emergency Management Agency (IEMA) were notified on Wednesday, June 14, 2017, at 1206 CDT and 1213 CDT, respectively, of the preliminary results of estimated quantity of curies of tritium release (approximately 0.009 curies of tritium) and the estimated volume of the release (approximately 35,000 gallons). The discharge flow did not leave the site boundary before reaching the permitted discharge pathway. The NRC Resident Inspector was notified of the update to IEPA and IEMA. Notified R3DO (Stone).
The Illinois Environmental Protection Agency (IEPA) and the Illinois Emergency Management Agency (IEMA) were provided with a follow-up report on June 16, 2017, at 1528 CDT as required by 35 IAC 1010.204. The report includes the estimated quantity of curies of tritium released (approximately 0.009 curies), the estimated volume of the release (approximately 35,000 gallons), and actions taken in response to the on-site release (installation of groundwater monitoring wells, implementation of a sampling program to monitor the concentrations and migration, if any, of the tritium in the groundwater on-site, and the installation of a remediation system). The NRC Resident Inspectors have been notified of the update to IEPA and IEMA. Notified R3DO (Stone).
On 6/20/2017, the Illinois Environmental Protection Agency (IEPA) Des Plaines Regional Office was sent a follow-up report pursuant to the Consent Order, dated March 11, 2010. This report contains that same information as the follow-up report required by 35 IAC 1010.204 that was submitted to the IEPA and the Illinois Emergency Management Agency on June 16. 2017. The NRC Resident Inspector has been notified of the update to IEPA. Notified R3DO (Pelke). |
Where | |
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Braidwood Illinois (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release Other Unspec Reqmnt | |
Time - Person (Reporting Time:+-0.4 h-0.0167 days <br />-0.00238 weeks <br />-5.4792e-4 months <br />) | |
Opened: | Ryan Cragg 13:50 Jun 12, 2017 |
NRC Officer: | Bethany Cecere |
Last Updated: | Jun 20, 2017 |
52802 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Braidwood with Other Unspec Reqmnt, 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | |
WEEKMONTHYEARENS 557222022-02-01T16:25:0001 February 2022 16:25:00
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